On September 5, a 3-judge U.S. District Court struck down Alabama’s U.S. House district boundaries. Singleton v Allen, 2:21cv-1291. The vote was 3-0. Because this was a 3-judge court, any appeal goes straight to the U.S. Supreme Court. It is considered very likely that the state will appeal.
Assuming the decision holds up, the petitioning period for any independent or unqualified party to run for U.S. House will necessarily be shortened. Under a published U.S. District Court decision from Alabama, Hall v Merrill, 212 F.Supp.3d 1148 (2016), when the normal petitioning period is substantially shorter than usual, the state must cut the number of signatures.
Here is the 217-page Singleton opinion. Two southern states have had their U.S. House districts struck down in the last two days; the Florida decision came out on Saturday, September 3.